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I have recently gutted my '69 Chevelle interior for restoration and obtained a set of buckets to replace my bench...

Question: The buckets fit fine, but before I drill the holes for the extra bucket vs. bench bolts, is it necessary to invest in the aftermarket bucket seat conversion brackets I see??

Would obtaining the brackets eliminate the need for extra hole-drilling all together, and if not, what size and form of hole-drilling should I perform for best fit and bolting, etc, etc, etc...

Any advice from those who have performed this conversion would be much appreciated.

Thanks, Edward.